> An SVG elliptical path is defined by two points on the ellipse, (xlast,ylast), (x,y) - the size rx,ry of the ellipse are known, and its rotation r.
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> >From this information, how do I derive the centre of the ellipse?
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> -(I tried to work through the maths but got stuck).
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> (There are two possible solutions. Additional parameters in the elliptical path description select which centre and which arc to draw).
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Simply follow steps 1, 2, 3 of
http://www.w3.org/TR/SVG/implnote.html#ArcConversionEndpointToCenter
The center is (cx, cy).
HTH
Fred
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